Tell them to immediately stop or you will file harassment charges and sue them for defamation.
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Spend a couple hundred bucks for a local lawyer to send them a strong "cease and desist" letter, and that should put an end to this nonsense.
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Here's a few suggestions:
1. Attorney cease and desist letter;
2. Go back to family law court and get an order prohibiting your ex from doing this if it is his son;
3. File a police report but don't expect much cooperation from law enforcement.
4. Complain to whatever web sites are hosting the comments.
This is not legal advice but a general comment on society based on a limited set of hypothetical circumstances. No one should act or refrain from acting based on these comments without seeking appropriately licensed legal or professional advice. The author disclaims all liability in respect to actions taken or not taken based on his comments.